• Proceedings of the KIEE Conference
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• 2015.07a
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• pp.1165-1166
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• 2015

현재 가장 널리 사용되고 있는 전력용 지중케이블의 고분자 절연재료인 가교 폴리에틸렌(XLPE)은 전기적, 기계적으로 특성이 우수하다는 장점을 가지고 있지만 열경화성으로 인해 재활용이 어렵다. 본 연구에서는 환경친화적인 전력용 케이블을 개발하기 위해 열경화성인 XLPE를 대체할 수 있는 열가소성의 고분자 절연재료를 개발하는 것이다. 이를 위해 후보군의 재료들에 대한 단기적인 특성인 교류절연파괴 시험을 시행하였다. 또한, 중장기 특성을 평가하기 위해 가속수명시험(accelerated life test: ALT)을 수행하였다. 신뢰성있는 실험결과를 위하여 교류절연파괴시험과 가속수명시험에는 McKeown 전극계를 제작, 사용하였다.

• Proceedings of the KIEE Conference
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• 2000.11c
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• pp.491-493
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• 2000

The performance of insulate materials gets worse with stress time in power system and because this causes lowering of function and accidents in equipment, development and performance improvement of excellent insulate materials are needed to make stable system. In this paper, to study the influence of degradation in XLPE, inner semiconducting layer and outer semiconducting layer, we studied dielectric characteristics at temperature $25{\sim}100[^{\circ}C]$ and frequency $20{\sim}1[MHz]$ and volume resistivity at temperature $25{\sim}100^{\circ}C$, voltage.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 1999.05a
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• pp.222-225
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• 1999

Degradation diagnosis of XLPE insulated URD cables was accomplished through out new method. which was to be analyzed non-electrical experiments and synthesized by degradation points. To supplement this method, it was also carried out using several electrical analyses. Breakdown voltages were measured and breakdown lifetimes were Predicted appling for Weibull distribution function. As a result, breakdown lifetime in failure cables was shorted up to 1/3 times than that in general cables. It was very available to estimate cable degradation using above method, but it needs further study on XLPE insulated URD cables in order to improve reliability.

• Proceedings of the KIEE Conference
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• 2007.04b
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• pp.72-74
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• 2007

Due to a variable noises in the field underground lines, clear technology of noises is very important in the diagnosis technology of partial discharge. Therefore we progressed filter test to improve the measuring test of partial discharge in a field. We applied to field test after making W-LC filter for partial discharge measurement, and then designed experimental environment such as underground distribution lines of field. Measuring sensor for test was UHF sensor. And we analysed those using the Lemke Probe and oscilloscope (TDS-3054, Tektronix). Finally, we obtained excellent data of noise decrement in the joint box of 22.9[kV] distribution lines from above experiment.

• Proceedings of the KIEE Conference
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• 2005.07c
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• pp.2277-2279
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• 2005

Due to a variable noises in the field underground lines, clear technology of noises is very important in the diagnosis technology of partial discharge. Therefore we progressed filter test to improve the measuring test of partial discharge in a field. We applied to field test after making W-LC filter for partial discharge measurement, and then designed experimental environment such as under-ground distribution lines of field. Measuring sensor for test was UHF sensor. And we analysed those using the Lemke Probe and oscilloscope (TDS-3054, Tektronix). Finally, we obtained excellent data of noise decrement in the joint box of 22.9[kV] distribution lines from above experiment.

• Proceedings of the KIEE Conference
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• 2007.07a
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• pp.752-753
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• 2007

154kV 초고압 케이블용 프리몰드 접속함은 기존의 접속 공법에 비해 부품수가 적으며 조립이 단순하여 숙련공이 아니라도 접속이 가능하고 높은 품질을 확보할 수 있어 앞으로 확대 사용될 것으로 예측된다. 신규개발에 따른 자재비의 일시적 상승은 있으나 전체 공사비가 절감될 뿐 아니라 케이블 접속공정의 단순화로 지중송전 케이블 접속분야 인력양성에 유리하며 접속작업 기간의 단축으로 케이블 고장발생시 신속한 복구를 통한 안정적인 전력공급에 크게 이바지 할 수 있다. 조립식접속함 분야는 이미 선진국에서 개발하여 널리 사용되고 있으며 후발업체에게 기술이전을 기피하기 위해 PQ조건등으로 후발업체를 강력하게 견제하고 있어 케이블 분야에 기술 자립을 이루고 수입대체 효과를 거두게 되었다.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2007.11a
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• pp.201-202
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• 2007

In this paper we investigated the partial discharge distribution using the K-means clustering according to the needle of tilt and void at the cross linked polyethylene(XLPE) insulators. As a result, the specimen with tilt $45^{\circ}$ has highest breakdown voltage and the specimen with air void has lower breakdown voltage than the specimen with on void. In K-menas clustering distribution of clusters concentrates at inception condition, but the distribution spreads widely at breakdown.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2007.11a
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• pp.203-204
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• 2007

This paper investigated the influence on partial discharge distribution of various defects at the model power cable joints interface using K-means clustering. As the result of analyzing discharge number distribution of ${\Phi}-n$ cluster, clusters shifted to $0^{\circ}\;and\;180^{\circ}$ with increasing applying voltage. It was confirmed that discharge quantity and euclidean distance between centroids were increased with applying voltage from the analyzing centroid distribution of ${\Phi}-q$ cluster. The degree of dispersion was increased with calculating standard deviation of ${\Phi}-q$ cluster centroid. The tendency both number of discharge and mean value of ${\Phi}-q$ cluster centroid were some different with defect types.

• Proceedings of the KIEE Conference
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• 2007.07a
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• pp.1449-1452
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• 2007

배전 케이블 부분방전 측정에서는 외부노이즈, 코로나가 동반되어 검출되고 있다. 특히, 단말부의 부분방전측정에서는 부분방전 현상이 크게 발생하여 측정될 경우 다른 상에서도 유입되어 검출되는데 코로나나 외부의 노이즈가 크게 유입될 경우 진단의 어려움이 있다. 더불어 각 상의 위상을 직접검출이 어려운 송배전 케이블의 단말에서는 유기된 신호의 상을 찾는데도 어려움을 주고 있다. 이러한 문제를 반영하여 현장 측정이 용의하도록 이동형 포터블 진단장치를 개발하였다. 3개의 HFCT 센서를 사용하여 3상을 동시 측정할 수 있도록 하였다. 전원 분압 트리거 회로와 전류 변류 트리거 회로를 사용하여 위상 분석을 병행하였다. 실선로의 배전 케이블 부분방전 진단의 효율적 수행을 위해 개발된 본 장비를 현장 적용하였으며 내장된 PRPD 분석법이 가능하였으며 S/W 노이즈 게이팅을 적용하여 다른상에서 유기되는 신호를 제거하여 진단결과의 신뢰성을 높일 수 있었다.

• Journal of the Korean Institute of Electrical and Electronic Material Engineers
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• v.27 no.12
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• pp.877-882
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• 2014

It has been confirmed that the inner defect of transformer and the perfect diagnosis for aging are closely related to safe electric power transmission system and that the detection of accident and diagnosis technique turn out to be very important issues. Since electric power machinery consists of various kinds of components, however, it is very difficult to make a diagnosis for aging by one parameter. Thus, diagnosis for aging is feasible only through the combination of various parameters. Recently, various expert systems have been developed and applied to diagnosis for aging, but they are not yet reliable enough to apply to the real system. In this paper, XLPE which is ultra high voltage cable insulator material were chosen to investigate the influence of void on insulator material using partial discharge. Obtained data have been processed by PRPD (phased resolved partial discharge) distribution function and K-means. And statistical and cluster distribution of partial discharge have been analysed and investigated.